Move VIEWLET_ID_ROOT to one place

src/vs/platform/explorers/browser/explorerExtensionPoint.ts

@@ -11,6 +11,7 @@ import { IJSONSchema } from 'vs/base/common/jsonSchema';
 import { ExtensionsRegistry } from 'vs/platform/extensions/common/extensionsRegistry';
 import { Registry } from 'vs/platform/platform';
 import { ViewletRegistry, Extensions as ViewletExtensions, ViewletDescriptor } from 'vs/workbench/browser/viewlet';
+import { VIEWLET_ID_ROOT } from 'vs/workbench/parts/explorers/common/treeExplorer';
 
 namespace schema {
 
@@ -66,7 +67,7 @@ ExtensionsRegistry.registerExtensionPoint<schema.IExplorer>('explorer', schema.e
 		descriptors.push(new ViewletDescriptor(
 			'vs/workbench/parts/explorers/browser/treeExplorerViewlet',
 			'TreeExplorerViewlet',
-			'workbench.view.customTreeExplorerViewlet.' + treeExplorerNodeProviderId,
+			VIEWLET_ID_ROOT + treeExplorerNodeProviderId,
 			treeLabel,
 			treeExplorerNodeProviderId,
 			baseOrder++,

src/vs/workbench/parts/explorers/browser/treeExplorerViewlet.ts

@@ -13,8 +13,7 @@ import { IInstantiationService } from 'vs/platform/instantiation/common/instanti
 import { TreeExplorerView } from 'vs/workbench/parts/explorers/browser/views/treeExplorerView';
 import { TreeExplorerViewletState } from 'vs/workbench/parts/explorers/browser/views/treeExplorerViewer';
 import { IActivityService } from 'vs/workbench/services/activity/common/activityService';
-
-export const VIEWLET_ID_ROOT = 'workbench.view.customTreeExplorerViewlet.';
+import { VIEWLET_ID_ROOT } from 'vs/workbench/parts/explorers/common/treeExplorer';
 
 export class TreeExplorerViewlet extends Viewlet {
 	private static _idCounter = 1;

src/vs/workbench/parts/explorers/common/treeExplorer.ts

+/*---------------------------------------------------------------------------------------------
+ *  Copyright (c) Microsoft Corporation. All rights reserved.
+ *  Licensed under the MIT License. See License.txt in the project root for license information.
+ *--------------------------------------------------------------------------------------------*/
+'use strict';
+
+export const VIEWLET_ID_ROOT = 'workbench.view.customTreeExplorer.';
\ No newline at end of file